/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.runtime.jobgraph;

import org.apache.flink.api.common.cache.DistributedCache;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.core.fs.FileSystem;
import org.apache.flink.core.fs.Path;
import org.apache.flink.util.FileUtils;
import org.apache.flink.util.FlinkRuntimeException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.nio.file.Files;
import java.util.Collection;

/**
 * Utilities for generating {@link JobGraph}.
 */
public enum JobGraphUtils {
	;

	private static final Logger LOG = LoggerFactory.getLogger(JobGraphUtils.class);

	public static void addUserArtifactEntries(Collection<Tuple2<String, DistributedCache.DistributedCacheEntry>> userArtifacts, JobGraph jobGraph) {
		if (userArtifacts != null && !userArtifacts.isEmpty()) {
			try {
				java.nio.file.Path tmpDir = Files.createTempDirectory("flink-distributed-cache-" + jobGraph.getJobID());
				for (Tuple2<String, DistributedCache.DistributedCacheEntry> originalEntry : userArtifacts) {
					Path filePath = new Path(originalEntry.f1.filePath);
					boolean isLocalDir = false;
					try {
						FileSystem sourceFs = filePath.getFileSystem();
						isLocalDir = !sourceFs.isDistributedFS() && sourceFs.getFileStatus(filePath).isDir();
					} catch (IOException ioe) {
						LOG.warn("Could not determine whether {} denotes a local path.", filePath, ioe);
					}
					// zip local directories because we only support file uploads
					DistributedCache.DistributedCacheEntry entry;
					if (isLocalDir) {
						Path zip = FileUtils.compressDirectory(filePath, new Path(tmpDir.toString(), filePath.getName() + ".zip"));
						entry = new DistributedCache.DistributedCacheEntry(zip.toString(), originalEntry.f1.isExecutable, true);
					} else {
						entry = new DistributedCache.DistributedCacheEntry(filePath.toString(), originalEntry.f1.isExecutable, false);
					}
					jobGraph.addUserArtifact(originalEntry.f0, entry);
				}
			} catch (IOException ioe) {
				throw new FlinkRuntimeException("Could not compress distributed-cache artifacts.", ioe);
			}
		}
	}
}
